Taking nonprescription cough, cold, or sinus
Eating or drinking foods with caffeine.
What To Think About
This test is not done very often. The 24-hour
urine test is better for finding high levels of catecholamines than a blood
test. For more information on a catecholamine urine test, see the topic
Catecholamines in Urine.
Another test, called the clonidine suppression test, may be done
to find out whether high blood pressure is caused by an adrenal gland tumor.
The clonidine suppression test measures your blood catecholamine levels before
and after you take a small dose of the high blood pressure medicine clonidine
(Catapres). If a tumor is present, clonidine will not cause your catecholamine
levels to change. If your high blood pressure is caused by other factors,
clonidine will cause your catecholamine levels to go down.
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis: